{"api_version":"1","generated_at":"2026-04-23T02:58:25+00:00","cve":"CVE-2001-0669","urls":{"html":"https://cve.report/CVE-2001-0669","api":"https://cve.report/api/cve/CVE-2001-0669.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2001-0669","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2001-0669"},"summary":{"title":"CVE-2001-0669","description":"Various Intrusion Detection Systems (IDS) including (1) Cisco Secure Intrusion Detection System, (2) Cisco Catalyst 6000 Intrusion Detection System Module, (3) Dragon Sensor 4.x, (4) Snort before 1.8.1, (5) ISS RealSecure Network Sensor 5.x and 6.x before XPU 3.2, and (6) ISS RealSecure Server Sensor 5.5 and 6.0 for Windows, allow remote attackers to evade detection of HTTP attacks via non-standard \"%u\" Unicode encoding of ASCII characters in the requested URL.","state":"PUBLISHED","assigner":"mitre","published_at":"2001-10-30 05:00:00","updated_at":"2025-04-03 01:03:51"},"problem_types":["NVD-CWE-Other","n/a"],"metrics":[{"version":"2.0","source":"nvd@nist.gov","type":"Primary","score":"7.5","severity":"","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","data":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"}}],"references":[{"url":"http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml","name":"http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Vendor Advisory"],"title":"Cisco Secure Intrusion Detection System Signature Obfuscation vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://marc.info/?l=bugtraq&m=99972950200602&w=2","name":"http://marc.info/?l=bugtraq&m=99972950200602&w=2","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.kb.cert.org/vuls/id/548515","name":"http://www.kb.cert.org/vuls/id/548515","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["US Government Resource"],"title":"CERT/CC Vulnerability Note VU#548515","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://xforce.iss.net/alerts/advise95.php","name":"http://xforce.iss.net/alerts/advise95.php","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Vendor Advisory"],"title":"","mime":"text/html","httpstatus":"-1","archivestatus":"200"},{"url":"http://www.securityfocus.com/bid/3292","name":"http://www.securityfocus.com/bid/3292","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Multiple IDS Vendor Encoded IIS Attack Detection Evasion Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2001-0669","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2001-0669","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"n/a","product":"n/a","version":"affected n/a","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"cisco","cpe5":"catalyst_6000_intrusion_detection_system_module","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"cisco","cpe5":"secure_intrusion_detection_system","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"enterasys","cpe5":"dragon","cpe6":"4.x","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"iss","cpe5":"realsecure_network_sensor","cpe6":"5.x","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"iss","cpe5":"realsecure_network_sensor","cpe6":"6.x","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"iss","cpe5":"realsecure_server_sensor","cpe6":"5.5","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"iss","cpe5":"realsecure_server_sensor","cpe6":"6.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2001","cve_id":"669","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"snort","cpe5":"snort","cpe6":"1.8.1","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-08T04:30:06.065Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"name":"VU#548515","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred"],"url":"http://www.kb.cert.org/vuls/id/548515"},{"name":"3292","tags":["vdb-entry","x_refsource_BID","x_transferred"],"url":"http://www.securityfocus.com/bid/3292"},{"name":"20010905 Cisco Secure Intrusion Detection System Signature Obfuscation Vulnerability","tags":["vendor-advisory","x_refsource_CISCO","x_transferred"],"url":"http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml"},{"name":"20010905 Multiple Vendor IDS Unicode Bypass Vulnerability","tags":["third-party-advisory","x_refsource_ISS","x_transferred"],"url":"http://xforce.iss.net/alerts/advise95.php"},{"name":"20010905 %u encoding IDS bypass vulnerability","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"],"url":"http://marc.info/?l=bugtraq&m=99972950200602&w=2"}],"title":"CVE Program Container"}],"cna":{"affected":[{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}],"datePublic":"2001-09-05T00:00:00.000Z","descriptions":[{"lang":"en","value":"Various Intrusion Detection Systems (IDS) including (1) Cisco Secure Intrusion Detection System, (2) Cisco Catalyst 6000 Intrusion Detection System Module, (3) Dragon Sensor 4.x, (4) Snort before 1.8.1, (5) ISS RealSecure Network Sensor 5.x and 6.x before XPU 3.2, and (6) ISS RealSecure Server Sensor 5.5 and 6.0 for Windows, allow remote attackers to evade detection of HTTP attacks via non-standard \"%u\" Unicode encoding of ASCII characters in the requested URL."}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2016-10-17T13:57:01.000Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre"},"references":[{"name":"VU#548515","tags":["third-party-advisory","x_refsource_CERT-VN"],"url":"http://www.kb.cert.org/vuls/id/548515"},{"name":"3292","tags":["vdb-entry","x_refsource_BID"],"url":"http://www.securityfocus.com/bid/3292"},{"name":"20010905 Cisco Secure Intrusion Detection System Signature Obfuscation Vulnerability","tags":["vendor-advisory","x_refsource_CISCO"],"url":"http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml"},{"name":"20010905 Multiple Vendor IDS Unicode Bypass Vulnerability","tags":["third-party-advisory","x_refsource_ISS"],"url":"http://xforce.iss.net/alerts/advise95.php"},{"name":"20010905 %u encoding IDS bypass vulnerability","tags":["mailing-list","x_refsource_BUGTRAQ"],"url":"http://marc.info/?l=bugtraq&m=99972950200602&w=2"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2001-0669","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Various Intrusion Detection Systems (IDS) including (1) Cisco Secure Intrusion Detection System, (2) Cisco Catalyst 6000 Intrusion Detection System Module, (3) Dragon Sensor 4.x, (4) Snort before 1.8.1, (5) ISS RealSecure Network Sensor 5.x and 6.x before XPU 3.2, and (6) ISS RealSecure Server Sensor 5.5 and 6.0 for Windows, allow remote attackers to evade detection of HTTP attacks via non-standard \"%u\" Unicode encoding of ASCII characters in the requested URL."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"VU#548515","refsource":"CERT-VN","url":"http://www.kb.cert.org/vuls/id/548515"},{"name":"3292","refsource":"BID","url":"http://www.securityfocus.com/bid/3292"},{"name":"20010905 Cisco Secure Intrusion Detection System Signature Obfuscation Vulnerability","refsource":"CISCO","url":"http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml"},{"name":"20010905 Multiple Vendor IDS Unicode Bypass Vulnerability","refsource":"ISS","url":"http://xforce.iss.net/alerts/advise95.php"},{"name":"20010905 %u encoding IDS bypass vulnerability","refsource":"BUGTRAQ","url":"http://marc.info/?l=bugtraq&m=99972950200602&w=2"}]}}}},"cveMetadata":{"assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","assignerShortName":"mitre","cveId":"CVE-2001-0669","datePublished":"2001-10-12T04:00:00.000Z","dateReserved":"2001-08-27T00:00:00.000Z","dateUpdated":"2024-08-08T04:30:06.065Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"nvd":{"publishedDate":"2001-10-30 05:00:00","lastModifiedDate":"2025-04-03 01:03:51","problem_types":["NVD-CWE-Other","n/a"],"metrics":{"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"HIGH","exploitabilityScore":10,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:cisco:catalyst_6000_intrusion_detection_system_module:*:*:*:*:*:*:*:*","matchCriteriaId":"670E75BE-D3CB-4BA7-BF17-F4CEFBA668D1"},{"vulnerable":true,"criteria":"cpe:2.3:a:cisco:secure_intrusion_detection_system:*:*:*:*:*:*:*:*","matchCriteriaId":"77012AED-148F-422C-AB0C-DBD7BB1D3493"},{"vulnerable":true,"criteria":"cpe:2.3:a:iss:realsecure_network_sensor:5.x:*:*:*:*:*:*:*","matchCriteriaId":"D0D349D6-057D-459C-861B-FF9BE193A3D2"},{"vulnerable":true,"criteria":"cpe:2.3:a:iss:realsecure_network_sensor:6.x:*:*:*:*:*:*:*","matchCriteriaId":"D1D78D55-2486-48C6-8766-D933328F585A"},{"vulnerable":true,"criteria":"cpe:2.3:a:iss:realsecure_server_sensor:5.5:*:*:*:*:*:*:*","matchCriteriaId":"AC67A95B-3CCF-469F-98C2-8D8C7B2E0F91"},{"vulnerable":true,"criteria":"cpe:2.3:a:iss:realsecure_server_sensor:6.0:*:*:*:*:*:*:*","matchCriteriaId":"42507EA0-009C-466B-A4AD-F7C050682F49"},{"vulnerable":true,"criteria":"cpe:2.3:a:snort:snort:1.8.1:*:*:*:*:*:*:*","matchCriteriaId":"12D3E0FE-0557-4B8F-A97B-1FBE6030C8CA"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:h:enterasys:dragon:4.x:*:*:*:*:*:*:*","matchCriteriaId":"2CE293CA-7874-4B54-8516-AF3469A3440D"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2001","CveId":"669","Ordinal":"1","Title":"CVE-2001-0669","CVE":"CVE-2001-0669","Year":"2001"},"notes":[{"CveYear":"2001","CveId":"669","Ordinal":"1","NoteData":"Various Intrusion Detection Systems (IDS) including (1) Cisco Secure Intrusion Detection System, (2) Cisco Catalyst 6000 Intrusion Detection System Module, (3) Dragon Sensor 4.x, (4) Snort before 1.8.1, (5) ISS RealSecure Network Sensor 5.x and 6.x before XPU 3.2, and (6) ISS RealSecure Server Sensor 5.5 and 6.0 for Windows, allow remote attackers to evade detection of HTTP attacks via non-standard \"%u\" Unicode encoding of ASCII characters in the requested URL.","Type":"Description","Title":"CVE-2001-0669"},{"CveYear":"2001","CveId":"669","Ordinal":"2","NoteData":"2001-10-12","Type":"Other","Title":"Published"},{"CveYear":"2001","CveId":"669","Ordinal":"3","NoteData":"2016-10-17","Type":"Other","Title":"Modified"}]}}}